Hi, I am a newb, please bear with me.

I am in the middle of piecing together my bike. I am going with a Ritchey stem with a cut Reynold Ouzo fork. The bike already had some spacers and with the stem that came with the frame, fits flush with the top cap. Now that I am going with the Ritchey stem (shorter stack height), there are gaps. In particular, when I mount the Ritchey stem on the steer tube, the top cap is sticking way above the top of the steer tube:



As you can see, if I screw the top cap down, I get ~1cm gap to the top of the stem


If I screw the top cap down on the steerer and then move the stem up to the top cap, I get a ~2cm gap for spacers (which I would get more spacers for):


Removing the top cap, I see that only one of the stem bolts is actually clamping on the headtube. The headtube is about 1cm below the top of the stem

Another angle:

My question is, do I move the stem all the way up to the top cap and leave only one stem bolt clamping down on the headtube? Or can I use a 1cm spacer between the stem and the top cap to fill the gap, and essence have the top stem bolt clamp onto the top cap? Is this correct? Or am I screwed?
Thanks
-jeff